@cult I know exactly what you're talking about but if a controller *dies* hard enough it will take down the OS with it. The hardware is not going to just ignore bad signals coming from the PCIE bus, it will kernel panic.

Can it survive if connected drives die in mysterious ways? Yes

Can it survive if the controller loses its link to the other end (JBOD or whatever)? yes

Can it survive a dying controller sending indecipherable signals? No. For the same reason your OS will crash if a stick of RAM does this. Not even ECC will save you when it's that bad.